plug socket size?

[harrylime]

My new spark plugs are on the way so I need to buy a suitable long socket spanner. Can anyone please confirm the size is 16mm? 

[Snaefell]

Spark plug socket is 16mm - across the flats - for both NGK and Bosch plugs.

 

Plug gap is 1.00mm (0.040").  Service interval is 40k miles, no time limit specified.

 

Spark plug torque is 25Nm.  Best to apply some grease to the thread prior to fitting.